Soldered joints are typically held in alignment using binding wire composed of ____________________?
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Answer: C. Soft iron
Explanation
Soft iron wire is commonly used as binding wire to hold components in alignment during soldering or brazing due to its ductility and high melting point. Soft iron maintains its structural integrity and mechanical strength at elevated temperatures required for joining metals. High ductility allows the wire to be tightly twisted around assembly joints without snapping or fracturing prematurely. Soldering and brazing operations join metal components using filler metals that melt at temperatures significantly below the base materials. Binding wire secures joint alignment preventing movement while molten filler metal flows via capillary action into the gap. Soft iron possesses low carbon content providing excellent formability and resistance to thermal degradation during heating.
Option A mild steel has higher carbon content making it less ductile and harder to twist tightly around delicate joints. Option B copper can alloy with solder or dissolve into the joint causing contamination and weakening the final connection. Option D stainless steel is expensive and excessively tough for routine manual wire twisting and binding applications.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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